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You searched for: subject:"PRESSURE OSCILLATIONS"
[texts]Simulation of Unsteady Flows Using an Unstructured Navier-Stokes Solver on Moving and Stationary Grids - Biedron, Robert T.
We apply an unsteady Reynolds-averaged Navier-Stokes (URANS) solver for unstructured grids to unsteady flows on moving and stationary grids. Example problems considered are relevant to active flow control and stability and control. Computational results are presented using the Spalart-Allmaras turbulence model and are compared to experimental data. The effect of grid and time-step refinement are examined.
Keywords: OSCILLATING FLOW; PRESSURE MEASUREMENT; PRESSURE OSCILLATIONS; DUCT GEOMETRY; PISTONS; PHASE SHIFT; INSERTS; STIRLING ENGINES
Downloads: 107
[texts]A Survey of Emerging Materials for Revolutionary Aerospace Vehicle Structures and Propulsion Systems - Harris, Charles E.
The NASA Strategic Plan identifies the long-term goal of providing safe and affordable space access, orbital transfer, and interplanetary transportation capabilities to enable scientific research, human, and robotic exploration, and the commercial development of space. Numerous scientific and engineering breakthroughs will be required to develop the technology required to achieve this goal. Critical technologies include advanced vehicle primary and secondary structure, radiation protection, prop...
Keywords: ROCKET ENGINES; PERFORMANCE TESTS; GAS GENERATORS; ACOUSTIC PROPERTIES; WALLS; TURBINE PUMPS; PRESSURE OSCILLATIONS; INJECTORS; IGNITERS
Downloads: 139
[texts]Stresses near an elliptic hole subject to oscillating pressure - Kubenko, V. D
Analysis of stresses near elliptic hole in thin infinite plate subject to oscillating pressure
Keywords: HOLES (MECHANICS); OSCILLATIONS; PRESSURE OSCILLATIONS; STRESS ANALYSIS; STRESS DISTRIBUTION; THIN PLATES; ELLIPSE; PRESSURE OSCILLATION; STRESS ANALYSIS
Downloads: 108
[texts]THE DC GENERATORS FOR UTILIZING WIND POWER - CARRER, A
THEORETICAL CONSIDERATIONS ARE EXPLAINED AND EXPERIMENTAL FINDINGS PERTAINING TO THE POSSIBILITY OF UTILIZING WIND POWER WITH ELECTROMECHANICAL UNITS COMPRISING VARIOUS TYPES OF DIRECT CURRENT MACHINES.
Keywords: FLAT PLATES; PIEZOELECTRIC TRANSDUCERS; PRESSURE OSCILLATIONS; TURBULENT BOUNDARY LAYER; FLAT SURFACES; HYPERSONIC FLOW; PRESSURE DISTRIBUTION; SHEAR STRESS; WALL FLOW
Downloads: 130
[texts]Exhaust Simulation Testing of a Hypersonic Airbreathing Model at Transonic Speeds - Huebner, Lawrence D.
An experimental study was performed to examine jet-effects for an airframe-integrated, scramjet-rocket combined-cycle vehicle configuration at transonic test conditions. This investigation was performed by testing an existing exhaust simulation wind tunnel model, known as Model 5B, in the NASA Langley 16-Ft. Transonic Tunnel. Tests were conducted at freestream Mach numbers from 0.7 to 1.2, at angles of attack from 2 to 14 degrees, and at up to seven nozzle static pressure ratio values for a set ...
Keywords: REAL TIME OPERATION; LEADING EDGES; FREE FLOW; ADAPTIVE CONTROL; FLOW CHARACTERISTICS; CAVITIES; ALGORITHMS; TRANSFER FUNCTIONS; WALL PRESSURE; SENSITIVITY; PRESSURE OSCILLATIONS
Downloads: 64
[texts]Documentation of photogrammetric mission simulator program. Volume 2: Global block adjustment module - NON
Documentation of photogrammetric mission simulator program with emphasis on global block adjustment module - Vol. 2
Keywords: COMBUSTION STABILITY; LIQUID PROPELLANT ROCKET ENGINES; NONLINEAR SYSTEMS; PROBLEM SOLVING; COMBUSTION CHAMBERS; MACH NUMBER; PRESSURE OSCILLATIONS; WAVEFORMS
Downloads: 92
[texts]Computer Analysis of Electromagnetic Field Exposure Hazard for Space Station Astronauts during Extravehicular Activity - Hwu, Shian U.
In order to estimate the RF radiation hazards to astronauts and electronics equipment due to various Space Station transmitters, the electric fields around the various Space Station antennas are computed using the rigorous Computational Electromagnetics (CEM) techniques. The Method of Moments (MoM) was applied to the UHF and S-band low gain antennas. The Aperture Integration (AI) method and the Geometrical Theory of Diffraction (GTD) method were used to compute the electric field intensities for...
Keywords: FLAMEOUT; PATENT APPLICATIONS; COMBUSTION CHAMBERS; PRESSURE SENSORS; ACOUSTIC MEASUREMENT; COMBUSTION CONTROL; FUEL CONTROL; PRESSURE OSCILLATIONS; PULSES; FUEL FLOW; ACOUSTIC FREQUENCIES
Downloads: 58
[texts]High-Speed Research-Propulsion Project Accomplishments - Manthey, Lori A
This past year has been one of great technical accomplishment for the propulsion element of NASA s High-Speed Research (HSR) Program. The HSR Program is a NASA/industry partnership to develop the high-risk/high-payoff airframe and propulsion technologies applicable to a second-generation supersonic commercial transport, or High-Speed Civil Transport (HSCT). The NASA Lewis Research Center manages the propulsion element, which also includes industry participation...
Keywords: COMBUSTION CHAMBERS; FREQUENCY RESPONSE; POWER SPECTRA; PRESSURE OSCILLATIONS; SOUND PRESSURE; EULER EQUATIONS OF MOTION; CONTROL EQUIPMENT; COMBUSTION STABILITY; MATHEMATICAL MODELS; PASSIVITY; HELMHOLTZ RESONATORS; ORIFICES; SYMMETRY; UNSTRUCTURED GRIDS (MATHEMATICS)
Downloads: 97
[texts]Model-Drive Architecture for Agent-Based Systems - Gradanin, Denis
The Model Driven Architecture (MDA) approach uses a platform-independent model to define system functionality, or requirements, using some specification language. The requirements are then translated to a platform-specific model for implementation. An agent architecture based on the human cognitive model of planning, the Cognitive Agent Architecture (Cougaar) is selected for the implementation platform...
Keywords: ACTUATORS; PROTOTYPES; FLOW VISUALIZATION; SCHLIEREN PHOTOGRAPHY; HIGH SPEED; PULSE DETONATION ENGINES; COMBUSTION CHAMBERS; FLOW REGULATORS; DETONATION; LASER INDUCED FLUORESCENCE; PRESSURE OSCILLATIONS; PRESSURE SENSORS
Downloads: 72
[texts]Equatorial Density Irregularity Structures at Intermediate Scales and Their Temporal Evolution - Kil, Hyosub
We examine high resolution measurements of ion density in the equatorial ionosphere from the AE-E satellite during the years 1977-1981. Structure over spatial scales from 18 km to 200 m is characterized by the spectrum of irregularities at larger and smaller scales and at altitudes above 350 km and below 300 km. In the low-altitude region, only small amplitude large-scale (lambda greater than 5 km) density modulations are often observed, and thus the power spectrum of these density structures ex...
Keywords: FUEL FLOW; REACTION KINETICS; PRESSURE SENSORS; PRESSURE OSCILLATIONS; IGNITION; FUEL VALVES; DYNAMIC PRESSURE; ACOUSTIC IMAGING; FLAMES; COMBUSTION CHAMBERS; HIGH PRESSURE; SOUND DETECTING AND RANGING; ACOUSTIC RESONANCE; VORTICES; STABILIZATION
Downloads: 53
[texts]Shuttle Spacesuit: Fabric/LCVG Model Validation - Wilson, J. W.
A detailed spacesuit computational model is being developed at the Langley Research Center for radiation exposure evaluation studies. The details of the construction of the spacesuit are critical to estimation of exposures and assessing the risk to the astronaut on EVA. Past evaluations of spacesuit shielding properties assumed the basic fabric lay-up (Thermal Micrometeroid Garment, fabric restraints, and pressure envelope) and Liquid Cooling and Ventilation Garment (LCVG) could be homogenized a...
Keywords: PRESSURE OSCILLATIONS; FORWARD FACING STEPS; POLYNOMIALS; FLIGHT CONDITIONS; TURBULENT BOUNDARY LAYER; PROBABILITY DENSITY FUNCTIONS; MATHEMATICAL MODELS; SUPERSONIC TRANSPORTS; PROBABILITY THEORY; ASYMMETRY; SKEWNESS; KURTOSIS
Downloads: 128
[texts]A method for prevention of screaming in rocket engines - Kerslake, W. R.
Prevention of high frequency combustion pressure oscillations by longitudinal fins in combustion chamber of rocket engine
Keywords: BURNOUT; ROCKET ENGINES; COMBUSTION CHAMBER; COMBUSTION INSTABILITY; FIN; PRESSURE OSCILLATION; ROCKET ENGINE NOISE; COMBUSTION; COMBUSTION CHAMBERS; COMBUSTION STABILITY; FINS; HIGH FREQUENCIES; PRESSURE OSCILLATIONS; PREVENTION; ROCKET ENGINE NOISE
Downloads: 142
[texts]An Atmospheric Atomic Oxygen Source for Cleaning Smoke Damaged Art Objects - Banks, Bruce A.
Soot and other carbonaceous combustion products deposited on the surfaces of porous ceramic, stone, ivory and paper can be difficult to remove and can have potentially unsatisfactory results using wet chemical and/or abrasive cleaning techniques. An atomic oxygen source which operates in air at atmospheric pressure, using a mixture of oxygen and helium, has been developed to produce an atomic oxygen beam which is highly effective in oxidizing soot deposited on surfaces by burning candles made of...
Keywords: SUBSONIC FLOW; NOZZLE FLOW; SOUND FIELDS; JET AIRCRAFT NOISE; AIR JETS; ENGINE NOISE; NEAR FIELDS; PRESSURE OSCILLATIONS; AERODYNAMIC NOISE; PRESSURE GRADIENTS; SOUND PRESSURE; PRESSURE DISTRIBUTION
Downloads: 122
[texts]Electrolysis Propulsion for Spacecraft Applications - deGroot, Wim A.
Electrolysis propulsion has been recognized over the last several decades as a viable option to meet many satellite and spacecraft propulsion requirements. This technology, however, was never used for in-space missions. In the same time frame, water based fuel cells have flown in a number of missions. These systems have many components similar to electrolysis propulsion systems. Recent advances in component technology include: lightweight tankage, water vapor feed electrolysis, fuel cell technol...
Keywords: UNSTEADY FLOW; BLUFF BODIES; PERIODIC VARIATIONS; ANGLE OF ATTACK; SUBSONIC WIND TUNNELS; RECTANGULAR WINGS; FLOW DISTRIBUTION; SEPARATED FLOW; FREQUENCIES; AERODYNAMIC STALLING; PRESSURE OSCILLATIONS
Downloads: 253
[texts]Effect of Molding and Machining on Neoflon CTFE M400H Polychlorotrifluoroethylene Rod Stock and Valve Seat Properties - Waller, Jess M.
Since 1997 numerous fires have been reported to the Food and Drug Administration involving cylinder valves installed on medical use oxygen cylinders sold and operated within the United States. All of the cylinder valves in question had polychlorotrifluoroethylene (PCTFE) valve seats. Subsequent failure analysis showed that the main seat was the primary source of ignition. A review of the incidents involving cylinder valve fires indicated three possible ignition mechanisms: contaminant promotion,...
Keywords: UNSTEADY AERODYNAMICS; PRESSURE DISTRIBUTION; SUPERSONIC WIND TUNNELS; INFLUENCE COEFFICIENT; PRESSURE MEASUREMENT; PRESSURE OSCILLATIONS; WIND TUNNEL TESTS; CASCADE FLOW; MACH NUMBER; SUPERSONIC FLUTTER; AIRFOIL OSCILLATIONS
Downloads: 109
[texts]Future manned systems advanced avionics study - Sawamura, Bob
COTS was defined in this study as commercial off-the-shelf (COTS) products, ruggedized and militarized components, and COTS technology. This study cites the benefits of integrating COTS in space, postulates a COTS integration methodology, and develops requirements and an architecture to achieve integration. Developmental needs and concerns were identified throughout the study; these needs, concerns, and recommendations relative to their abatement are subsequently presented for further action and...
Keywords: CENTRIFUGAL PUMPS; FLOW DISTRIBUTION; LEAKAGE; PRESSURE OSCILLATIONS; COMPUTATIONAL FLUID DYNAMICS; DYNAMIC STRUCTURAL ANALYSIS; INCOMPRESSIBLE FLUIDS; PUMP IMPELLERS; ROTOR DYNAMICS; SHROUDED TURBINES; COMPRESSIBILITY EFFECTS; DYNAMIC CHARACTERISTICS
Downloads: 343
[texts]Magnetic Bearing Amplifier Output Power Filters for Flywheel Systems - Lebron-Velilla, Ramon C.
Five power filters and two types of power amplifiers were tested for use with active magnetic bearings for flywheel applications. Filter topologies included low pass filters and low pass filters combined with trap filters at the PWM switching frequency. Two state and three state PWM amplifiers were compared. Each system was evaluated based on current magnitude at the switching frequency, voltage magnitude at 500 kHz, and power consumption...
Keywords: ACTIVE CONTROL; FUEL SYSTEMS; FUEL FLOW; HIGH FREQUENCIES; COMBUSTION STABILITY; AIRCRAFT ENGINES; GAS TURBINE ENGINES; PRESSURE REDUCTION; PRESSURE OSCILLATIONS; FUEL VALVES; FUEL TESTS
Downloads: 172
[texts]Shuttle Primary Reaction Control Subsystem Thruster Fuel Valve Pilot Seal Extrusion: A Failure Correlation - Waller, Jess
Pilot operated valves (POVs) are used to control the flow of hypergolic propellants monomethylhydrazine (fuel) and nitrogen tetroxide (oxidizer) to the Shuttle orbiter Primary Reaction Control Subsystem (PRCS) thrusters. The POV incorporates a two-stage design: a solenoid-actuated pilot stage, which in turn controls a pressure-actuated main stage. Isolation of propellant supply from the thruster chamber is accomplished in part by a captive polytetrafluoroethylene (PTFE) pilot seal retained insid...
Keywords: NOISE (SOUND); MACH NUMBER; JET AIRCRAFT NOISE; RAYLEIGH SCATTERING; SOUND PRESSURE; NOISE GENERATORS; PRESSURE OSCILLATIONS; SUBSONIC FLOW; SHEAR LAYERS; NONINTRUSIVE MEASUREMENT
Downloads: 92
[texts]Computation of Turbulent Wake Flows in Variable Pressure Gradient - Duquesne, N.
Transport aircraft performance is strongly influenced by the effectiveness of high-lift systems. Developing wakes generated by the airfoil elements are subjected to strong pressure gradients and can thicken very rapidly, limiting maximum lift. This paper focuses on the effects of various pressure gradients on developing symmetric wakes and on the ability of a linear eddy viscosity model and a non-linear explicit algebraic stress model to accurately predict their downstream evolution...
Keywords: BOUNDARY LAYER SEPARATION; INCOMPRESSIBLE FLOW; PRESSURE OSCILLATIONS; UPSTREAM; VORTICES; WAKES; AIRFRAMES; UNSTEADY FLOW; SHOCK LAYERS; AIRFOILS; HIGH REYNOLDS NUMBER; FREQUENCY RANGES; COMPRESSIBLE FLOW; BUFFETING
Downloads: 63
[texts]A Novel Spacecraft Charge Monitor for LEO - Goembel, Luk
Five years ago we introduced a new method for measuring spacecraft chassis floating potential relative to the space plasma (absolute spacecraft potential) in low Earth orbit. The method, based on a straightforward interpretation of photoelectron spectra, shows promise for numerous applications, but has not yet been tried. In the interest of testing the method, and ultimately supplying another tool for measuring absolute spacecraft charge, we are producing a flight prototype Spacecraft Charge Mon...
Keywords: CYLINDRICAL SHELLS; FREQUENCY DISTRIBUTION; GALERKIN METHOD; DISPLACEMENT; DEFORMATION; AIRCRAFT NOISE; PRESSURE OSCILLATIONS; SHELL THEORY; SOUND TRANSMISSION; MATHEMATICAL MODELS; TURBULENT BOUNDARY LAYER; SANDWICH STRUCTURES; SUBSONIC FLOW; SUPERSONIC FLOW
Downloads: 91
[texts]Viscoplastic Model Development to Account for Strength Differential: Application to Aged Inconel 718 at Elevated Temperature - Iyer, Saiganes
The magnitude of yield and flow stresses in aged Inconel 718 are observed to be different in tension and compression. This phenomenon, called the Strength differential (SD), contradicts the metal plasticity axiom that the second deviatoric stress invariant alone is sufficient for representing yield and flow. Apparently, at least one of the other two stress invariants is also significant. A unified viscoplastic model was developed that is able to account for the SD effect in aged Inconel 718...
Keywords: ACOUSTIC EMISSION; PRESSURE OSCILLATIONS; METHOD OF CHARACTERISTICS; MAGNETIC FIELDS; BOUNDARY CONDITIONS; ROTORS; DEFORMATION; GENERATORS; COVERINGS; SYMMETRY; SOUND PRESSURE; SIMULATION; RUNGE-KUTTA METHOD
Downloads: 126
[texts]ATTENUATION OF TANGENTIAL-PRESSURE OSCILLATIONS IN A LIQUID-OXYGEN -N-HEPTANE ROCKET ENGINE WITH LONGITUDINAL FINS - Priem, R. J
Attenuation of tangent-pressure oscillation in liquid-oxygen-heptane rocket engine combustion chamber using longitudinal fin
Keywords: COMBUSTION CHAMBERS; COMBUSTION CHAMBER; FIN; HEPTANE; LIQUID OXYGEN /LOX/; LIQUID PROPELLANT ROCKET ENGINE; PRESSURE OSCILLATION; FINS; HEPTANES; HIGH FREQUENCIES; LIQUID OXYGEN; LIQUID PROPELLANT ROCKET ENGINES; OSCILLATIONS; PRESSURE OSCILLATIONS; ROCKET ENGINES
Downloads: 91
[texts]Spray combustion stability project - Jeng, San-Mou
This report summarizes research activity on the Spray Combustion Stability Project, characterizes accomplishments and current status, and discusses projected future work. The purpose is to provide a concise conceptual overview of the research effort so the reader can quickly assimilate the gist of the research results and place them within the context of their potential impact on liquid rocket engine design technology...
Keywords: AERODYNAMIC LOADS; HYPERSONIC FLOW; PRESSURE DISTRIBUTION; PRESSURE OSCILLATIONS; SHOCK WAVES; BOUNDARY LAYER CONTROL; BOUNDARY LAYER SEPARATION; CORNER FLOW; HYPERSONIC BOUNDARY LAYER; SHOCK WAVE INTERACTION; TURBULENT BOUNDARY LAYER; UNSTEADY FLOW; VORTEX GENERATORS
Downloads: 98
[texts]Dilution Jets in Accelerated Cross Flows - Lipshitz, Abraham
Results of flow visualization experiments and measurements of the temperature field produced by a single jet and a row of dilution jets issued into a reverse flow combustor are presented. The flow in such combustors is typified by transverse and longitudinal acceleration during the passage through its bending section. The flow visualization experiments were designed to examine the separate effects of longitudinal and transverse acceleration on the jet trajectory and spreading rate...
Keywords: FLOW MEASUREMENT; AIRCRAFT NOISE; RAYLEIGH SCATTERING; QUADRUPOLES; RADIAL VELOCITY; SHEAR LAYERS; NOISE SPECTRA; NONINTRUSIVE MEASUREMENT; FLOW VELOCITY; SOUND PRESSURE; PRESSURE OSCILLATIONS; PLUMES; JET FLOW; HIGH SPEED; MACH NUMBER; AEROACOUSTICS
Downloads: 90
[texts]Laboratory Astrophysics Under the Ultraviolet, Visible, and Gravitational Astrophysics Research Program - Federman, Steven R
Space-borne facilities, such as the Hubble Space Telescope, the recent ORFEUS-SPAS II Shuttle mission, and the soon-to-be launched Far Ultraviolet Spectroscopic Explorer, are providing data at ultraviolet wavelengths of unprecedented quality for spectroscopic studies of many astronomical environments. The first step in the analysis of these data involves the derivation of abundances. Obtaining accurate abundances is possible only when the correspondence between line strength and abundance is wel...
Keywords: AEROACOUSTICS; EXHAUST GASES; MACH NUMBER; PRESSURE MEASUREMENT; PRESSURE DISTRIBUTION; NOISE REDUCTION; FLOW VELOCITY; MOMENTUM; EXHAUST VELOCITY; CONVERGENT NOZZLES; JET FLOW; SUBSONIC FLOW; HIGH REYNOLDS NUMBER; PRESSURE OSCILLATIONS; FLOW CHARACTERISTICS; ENGINE NOISE; EXHAUST NOZZLES
Downloads: 80
[texts]Roll-yaw control at high angle of attack by forebody tangential blowing - Pedreiro, N.
The feasibility of using forebody tangential blowing to control the roll-yaw motion of a wind tunnel model is experimentally demonstrated. An unsteady model of the aerodynamics is developed based on the fundamental physics of the flow. Data from dynamic experiments is used to validate the aerodynamic model. A unique apparatus is designed and built that allows the wind tunnel model two degrees of freedom, roll and yaw...
Keywords: HYBRID PROPELLANT ROCKET ENGINES; PROPULSION SYSTEM PERFORMANCE; COMBUSTION CHAMBERS; EMBEDDING; LEADING EDGES; THERMOCOUPLES; RADIOGRAPHY; LAMINAR BOUNDARY LAYER; POLYBUTADIENE; HTPB PROPELLANTS; SURFACE TEMPERATURE; OXYGEN; PRESSURE OSCILLATIONS; COMBUSTION PHYSICS; TURBULENT COMBUSTION
Downloads: 67
[texts]Ground Testing A 20-Meter Inflation Deployed Solar Sail - Mann, Troy
Solar sails have been proposed for a variety of future space exploration missions and provide a cost effective source of propellantless propulsion. Solar sails span very large areas to capture and reflect photons from the Sun and are propelled through space by the transfer of momentum from the photons to the solar sail. The thrust of a solar sail, though small, is continuous and acts for the life of the mission without the need for propellant...
Keywords: THIN WALLS; STIFFNESS; DYNAMIC RESPONSE; ALUMINUM; BEAMS (SUPPORTS); BOUNDARY CONDITIONS; DEGREES OF FREEDOM; FINITE ELEMENT METHOD; ACOUSTICS; MATHEMATICAL MODELS; DIRECT NUMERICAL SIMULATION; DYNAMIC STRUCTURAL ANALYSIS; STRUCTURAL DESIGN; NONLINEARITY; DISPLACEMENT; PRESSURE OSCILLATIONS; THERMAL BUCKLING
Downloads: 76
[texts]Preventing Damaging Pressure Gradients at the Walls of an Inflatable Space System - Scialdone, John J
An inflatable structural system to deploy a space system such as a solar shield, an antenna or another similar instrument, requires a stiffening element after it is extended by the inflated gas pressure. The stiffening element has to be packaged in a folded configuration before the deployment. It must be relatively small, lightweight, non-damaging to the inflated system, and be able to become stiff in a short time...
Keywords: DENSITY (MASS/VOLUME); CONTINUOUS WAVE LASERS; DIAMETERS; ELECTROMAGNETIC RADIATION; FIBER OPTICS; FREQUENCY RANGES; PHOTOMULTIPLIER TUBES; PHOTONS; RAYLEIGH SCATTERING; VORTICES; AIR CONDITIONING; SUPERSONIC JET FLOW; CORRELATION; CROSS CORRELATION; FLOW CHARACTERISTICS; FLOW DISTRIBUTION; PRESSURE OSCILLATIONS; TURBULENT FLOW
Downloads: 126
[texts]Flow Analysis of the Cleveland Clinic Centrifugal Pump - Veres, Joseph P.
An implantable ventricular assist rotordynamic blood pump is being developed by the Cleveland Clinic Foundation in cooperation with the NASA Lewis Research Center. At the nominal design condition, the pump provides blood flow at the rate of 5 liters per minute at a pressure rise of 100 mm of mercury and a rotative speed of 3000 RPM. Bench testing of the centrifugal pump in a water/glycerin mixture has provided flow and pressure data at several rotative speeds...
Keywords: SOLID PROPELLANT ROCKET ENGINES; DROPS (LIQUIDS); CAVITIES; PHOTOGRAPHIC FILM; RADIOGRAPHY; ACCELEROMETERS; CALORIMETERS; STRAIN GAGES; SHEAR LAYERS; ROCKET NOZZLES; PLUMES; PROPULSION SYSTEM PERFORMANCE; SLAGS; ALUMINUM OXIDES; EJECTION; PRESSURE OSCILLATIONS; REUSABLE ROCKET ENGINES; STATIC TESTS; FLIGHT TESTS
Downloads: 112
[texts]The 11 Micron Emissions of Carbon Stars - Goebel, J. H.
A new classification scheme of the IRAS LRS carbon stars is presented. It comprises the separation of 718 probable carbon stars into 12 distinct self-similar spectral groupings. Continuum temperatures are assigned and range from 470 to 5000 K. Three distinct dust species are identifiable: SiC, alpha:C-H, and MgS. In addition to the narrow 11 micron emission feature that is commonly attributed to SiC, a broad 11 micron emission feature, that is correlated with the 8.5 and 7.7 micron features, is ...
Keywords: PRESSURE MEASUREMENT; F-18 AIRCRAFT; FREE FLOW; SIDESLIP; WIND TUNNEL MODELS; RUDDERS; ACTUATORS; LEADING EDGES; TRAILING EDGES; DATA CORRELATION; PRESSURE OSCILLATIONS; ANGLE OF ATTACK; PRESSURE SENSORS; WIND TUNNEL TESTS; BENDING MOMENTS; PRESSURE DISTRIBUTION; TAIL ASSEMBLIES; BUFFETING; FULL SCALE TESTS; SCALE MODELS
Downloads: 63
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